If you are qualified for disability, you should file for it, and the sooner the better. I got stumped on one of the very first questions. Date on onset? I have chronic conditions that did NOT disable me until they progressed over many years, finally forcing me out of the workplace, when I could no longer perform my job duties. It wasn't like I had an accident or sudden injury, so I did not have a "date" of onset in my mind. I finally took my best shot and used the date I quit my job. That really was the date that my conditions prevented me from performing my duties.

Hope things work out well for you. Keep us posted.